Sprayer paddle-wheel



A. HOLMSTRCM.

SPRAYER PADDLE WHEEL.

APPLICATION FILED MAR. 10, 1920.

1,391,057, PatentedSept. 20,1921.

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SPEAKER; PADDLE-WHEEL.

Specification a: Letters Patent. Patented Sept. 20, 1921.

' "a lication filed latch. is, 19201 Serial R0. 384,708.

To ail whom. it may concern:

Be it known that I, Axnr. Honmsrnom, a subject of the Kin of Sweden,residing at Wiggbyholm, Swe en, have invented a certain new and usefulSprayer Paddle-Wheel, of which the following is a specification.

My invention relates to paddle wheels which are intended to carrypaddles for stirrin or spraying liquid.

he main purpose of my inventlon is to distribute the paddlesdisconnectedly and out of line so aslto give nearly noiseless, mild andgentle contact and at the same time secure firm and powerful operation.

A further purpose is to divide the blow or impact of the blade or bladescarried by the wheel so as to distribute the torque through-- out therotation of the wheel.

A further urpose is to cheapen the con-' struction of t e paddle wheelby making it of independent sections which may be fastened together in apredetermined order or in vafi'iant orders tomake up the complete lenurther purposes will appear in the specification and in the claims.

I have preferred to illustrate my invention by but one main form, amongmany which will occur to those skilled in theart in view of thisdisclosure, selecting a form which is ractical, efficient andinexpensive and whic at the same time well illustrates the principles ofmy invention.

Figure 1 is a side elevation, partly in section, of thepreferred form ofmy invention.

. Fig. 2 is a section upon line 2-2 of Fig. 1.

Fig. 3 is a erspective view of one of the end sections siown in Fig. 1.

Figs. 4 and 5 are perspective views of end sections similar to that 1nFig. 3 but having modifiededges.

Fig. 6 is a perspective viewof an intermediate section showing othermodifications.

In the drawings similar numeralsindicate like parts. g

Paddle wheels for stirring or distributing liquids are useful in manyarts. Some used in etchin are shown in my Patent No.

979,071 0 December 20, 1910. Though I find the greatest utility for thepresent paddle wheel in spraying liquidsfor etching purposes, and canuse it in any of the relations for wh ch spraying wheels are suited, Idonot limit it to this use but may apply it in other arts and for otherthan spraying pu oses.

ere a single blade extends axially of the wheel for its'full length, asin existing apparatus, and 1s, dipped beneath the liquid surface andremoved from itat the rate of five hundred revolutions or more perminute,not uncommon in etchingthe torque from the impact is a maximumand action takes place simultaneously throughout the length of thewheel, producing considerable nolse and causing unbalanced strains uponthe shaft. This is improved but little by are distributed lengthwise, toform the complete effective blade of angularly spaced sections' so thatone part of the length of the blade dips into the'liquid at one time andanother or other parts of the blade into the liquid at'other times untilthe entire length of the blade has been dipped. Then or in the meantime, the first blade or another blade in circular line with it maybedipped to begina new series of operations.

Describing the drawing by way of illustration and not in limitation, inFi 1, 2

and3 I show a sectional paddle whee whose 'blade is made 11' ofparts-10, 11, 12,-13, 14-,

15, 16 and 17. hese extend from the wheel in different angular positionsand for convenience are here arranged in a helical form so that a line18, drawn through the centers of the blade edges will form a helix. The

several sections are mounted upon any suitable shaft 19,'which is hereshown as of noncircular cross section uare-but which may be of anysection desired. Where it is of non-circular cross section it may beextended to form bearings, not shown, or the bearings may be provided byhubs or other means mounted upon the shaft. Hubs capable of this purposeare shown upon the end sections at 20 and 21 and in this case are thesame size as the bodies 22 of the wheels. However, the usual purpose ofthese hubs is to afford a sealing surface with which an etching casingengages to prevent leakage of the etching liquid past the hubs.

The non-circular cross section of shaft has an advantage in the rigidityof the mounting of the several sections upon the'shaft to preventrotation; as they need only he slipped over the end and are at all timesthus rigidly held, but has a disadvantage in requiring that the relationbetween the blade upon a section and the section'must be fixedpreliminarily and can be changed only as the shaft permits the entiresection to be put on in different angular positions. In

igs. 2, 3 and 4 but four such shifts of position are permitted and twodifferent forms of intermediate sections are required; while in Fig. 5the octagonal opening permits the staggering of the same b ade sectionto any of the eight positions and requires different section form forsome such purpose only as providing end hubs. In the case of a circularshaft section (such ,as in Fig. 6) the most of the sections carrying theblades may also be alike. These like sections may then be staggeredabout the shaft in different angular positions to suit the need orpreference, being held in place by suitable retaining mechanism andcorresponding in number and in angular displacement to the paddle wheellength which the width of the casing provides. i

The sections shown in Fig. 1 upon the square shaft may be held in placeby a variety of means. The set screws 23 will ordinarily be sufficient.In addition to them, if desired, 'or instead of them the shaft 19 may bethreaded at 19' to receive nuts 28 by WhlCh all of the sections may beheld tightly as a unit.

In Fig. 3 the blade is shown as having one straight face 24 which may beradial to the shaft axis, and a convex curved face 25, meeting in astraight edge 26. The special advantage of the curved convex surfacelies in the partial vacuum effect produced by it when it is the trailingsurface, causing it to take up and carry more liquid than wouldotherwise be the case.

Where the device is used for spraying liquids there is advantageous,increase in the quantity of liquid sprayed in rotating the blade in aclockwise directionof Fig. 3 both because of this vacuum effect andbecause the straight face 24 in that event' picks u; a lar r quantity ofthe liquid than woul be pic ed up by the curved face if it were theworkin face. Concaved faces 24' are shown in Fig. 6 for the purpose ofscooping up additional liquid. The shapes of the facesmay otherwise bevaried to suit the needs or whim of the user, while obtaining part'ofthe advantage of my invention.

The edge 26 need not be straight, as shown but may have any suitablecontour of which I have shown several different interrupted or serratedfaces at 26 and 26 in-Figs. 4 and 5. y

In Fig. 5 I have shown openings 29 through which some of the liquid maybe forced by movement of the blade and by the direction of whose wallsthe liquid may be directed away from the axis of the paddle for sprayingpur oses.

In the form in ig. 6 I have shown multiple blades, here two, upon thesame section and uniformly spaced.

Instead of the square opening 27 shown in Fig. 3, I show an octagonalopening 27 in Fig. 5 and a circular opening 27 .in the structure shownin Fig. 6, so that thosesections maybe turned to different angles to advantage. The sections may then be held against rotation by end clampingunits 28'or otherwise.

The material used for my wheel is not of the essence of my invention.Glass and porcelain are suitable.

I recognize that the disclosure of sectional paddle wheels made bymeherein will point out to those skilled in the art many other forms inwhich my invention may appear. I desire to cover by my claims all suchas they come within the spirit and scope of m invention.

aving thus described my invention, what I claim as new and desire tosecure by Letters Patent is Y 1. A paddle wheel for spraying or surfacestirring of liquids, comprising a shaft, a plurality of sections uponthe shaft, means for holding the sections against longitudinal andcircumferential movement about the shaft, and separate blades upon thedifferent sections having recessed faces on one side of each blade,recessed through the blades and having convex trailing surfaces aboutthe recess. 1

4. A blade for a spraying paddle wheel.

having a hub connection, a convex trailing surface and substantiallyuniform width from the hub to the rim.

5. A blade for a paddle wheel having a hub connection, a convex trailingsurface and an interrupted edge. A

6. A blade for spraying paddle wheels which is solid from the. hub tothe rim and construction in which the leading face of one blade beginsapproximately in line with 10 the end of the traillng face of the nextadjoining section. v

8. A spraying blade and hub in which the trailing edge of the blade isconvex and approximately merges into the surface of 15 the hub.

AXEL HOLMSTRUM.

